Extravasation or inadvertent infiltration of fluids into subcutaneous tissue from peripheral intravenous (IV) devices is a common adverse event in newborns. (1)(2) Although fluids occasionally extravasate from central venous lines, the complication is much more common from peripheral catheters, which are used widely in sick neonates. (3) This article focuses on extravasations from peripheral IV devices. Injury to the skin, even in a very immature neonate, results in an inflammatory response and heals by scar formation. (4) Although the scars from many of these injuries appear to improve with time, (5) tissue necrosis from extravasation injury could result in partial or complete skin loss, infection, and nerve and tendon damage, with the potential risk of permanent cosmetic and functional impairment. (6)(7)(8) The incidence of extravasations from Teflon® catheters has been reported to vary from 23% to 63%. (1) A recent survey of regional neonatal intensive care units in the United Kingdom recorded the prevalence of extravasation injury resulting in skin necrosis as 38 per 1,000 neonates, with 70% of these injuries occurring in infants of 26 weeks’ gestation or less. (2) The incidence of extravasation is related closely to the type of device used, insertion site, duration of therapy, infusate administered, patient activity, and gestational age. (1)(3)(9)(10) The fragility of the skin, particularly in the first 2 weeks after birth, and the lack of subcutaneous tissue in preterm neonates makes them uniquely susceptible to injury and skin loss. Extravasation may occur from the tip of the cannula or needle piercing the vessel wall. Alternatively, distal obstruction of the vein due to thrombosis or venoconstriction from irritation of the vessel wall may lead to increased back pressure and leakage from the entry point of the needle or …